The ergonomic design of the Alvin Argentum Mesh-Back Task Chair lets you sit comfortably all day. The tightly stretched silver mesh on the contoured backrest gives you good lumbar support. Adjust the tilt and height of the backrest independently or together with the seat tilt. The molded foam seat also adjusts in height to suit your needs. The polished aluminum base looks stylish and rolls easily over most surfaces with dual-wheel casters.